Process for producing metal foil coated with flame sprayed ceramic

Abstract

A metal foil coated with flame sprayed ceramic is produced in high productivity by flame spraying a ceramic on a surface of a metal foil, while spraying the rear side of the metal foil to be flame sprayed with water from an array of water nozzles arranged across the metal foil for cooling and providing tension to the metal foil.

What is claimed is: 
     
       1. A process for producing a metal foil coated with flame sprayed ceramic, which comprises positioning a metal foil substantially horizontally between a pair of parallel rolls, flame spraying a ceramic on an upper surface of the metal foil, while contacting a rear side of the metal foil, on which the ceramic is flame sprayed, with water by ejecting water from a plurality of water spray nozzles disposed below and transversely across the rear side of the metal foil so that tension is given to the metal foil by water pressure across the metal foil. 
     
     
       2. The process according to claim 1, wherein the metal foil is a copper foil. 
     
     
       3. The process according to claim 1, wherein the flame sprayed ceramic is a material principally composed of alumina. 
     
     
       4. The process according to claim 1, wherein the flame sprayed ceramic is a material principally composed of mullite. 
     
     
       5. A process for producing a metal foil coated with flame sprayed ceramic, which comprises carrying out flame sprayed coating of ceramic on a metal foil by delivering the rolled metal foil from a stock roll and taking up the coated metal foil on a take-up roll, wherein the metal foil delivered from the positioned halfway in its transfer from stock roll to take-up roll is flame spray coated with ceramic by a spraygun moved thereabove reciprocatively and across the metal foil while contacting the rear side of the metal foil with water rejected from a plurality of water spray nozzles disposed below the rear side of the metal foil, said water spray nozzles being arranged transversely to the direction of delivery of the metal foil so that tension is given to the metal foil on which the ceramic is flame sprayed by water pressure applied across the metal foil. 
     
     
       6. The process according to claim 5, wherein the flame sprayed ceramic is a material principally composed of mullite. 
     
     
       7. The process according to claim 5, wherein the metal foil is a copper foil. 
     
     
       8. The process according to claim 5, wherein the flame sprayed ceramic is a material principally composed of alumina. 
     
     
       9. A process for producing a metal foil coated with flame sprayed ceramic, comprising a step of forming a flame sprayed ceramic coating on a section of metal foil delivered from a payoff device and positioned between said payoff device and a take-up device, wherein a flame sprayed ceramic coating operation is performed on said section of metal foil by once stopping said payoff and take-up devices to let the metal foil stay stationary and fixing edges of said section of metal foil while contacting a rear side of said section of metal foil between said edges with water ejected from a plurality of water spray nozzles disposed below and across the width of said section of metal foil so that tension is given to said metal foil by water pressure of the water impinging upon the rear side of the width of the metal foil, and a step in which after said flame sprayed ceramic coating has been completed, said payoff device and said take-up device are operated to bring a next section of metal foil to be flame spray coated to a prescribed position between the payoff device and said take-up device, said steps being carried out repeatedly. 
     
     
       10. The process according to claim 9, wherein fixing of the section of metal foil to be flame spray coated is effectuated by having said edges attached fast to the opening of a suction device by a sucking force. 
     
     
       11. The process according to claim 9, wherein the metal foil is a copper foil. 
     
     
       12. The process according to claim 9, wherein the flame sprayed ceramic is a material principally composed of alumina. 
     
     
       13. A process according to claim 9, wherein the flame sprayed ceramic is a material principally composed of mullite.